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一、前言某枢纽溢流坝位于河床中部,采用混凝土重力坝型式,建于花岗岩弱风化层上,全长246.5米。溢流坝段设计要满足以下运行条件:当水库在起调水位20米时,溢流坝保持堰流状态,泄量为9200米~3/秒;当5年及20年一遇洪水时,溢流坝尽量维持堰流状态;在其它来水流量情况下,溢流坝均为控制泄洪,校核洪水时,要求能下泄27100米~3/秒;为满足上述泄洪要求,采用降低堰顶高程并带有胸墙的大孔口泄洪布置方案。坝段宽17.5米,基础高程-15.0米,堰顶高程8.5米,坝顶高程34.5米,最大坝高49.5米。
I. INTRODUCTION A hub overflow spillway is located in the middle of the riverbed. It adopts the concrete gravity dam type and is built on the weathered layer of granite with a total length of 246.5 meters. The design of spillway dam should meet the following operating conditions: when the reservoir is at a water level of 20m, the spillway dam will maintain the weir flow state and the discharge volume will be 9200m ~ 3 / s; when floods occur in 5 and 20 years, The spillway tries its best to keep the weir flow state. When the spillway is under other conditions, the spillway dam controls the flood discharge. When checking the flood, it is required to discharge 27100m ~ 3 / s. To meet the above flood discharge requirements, Elevation and a large orifice with chest wall flood discharge layout program. The dam section is 17.5 meters wide, the base elevation is -15.0 meters, the weir crest elevation is 8.5 meters, the crest elevation is 34.5 meters and the maximum dam height is 49.5 meters.